From 0ae045ae439ad83692ad039a554f7d62acf9de5c Mon Sep 17 00:00:00 2001
From: ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon, 25 Jun 2007 13:47:44 +0000
Subject: [PATCH] Insufficient input validation in NE2000 card, written by
 Tavis Ormandy, contributed by Aurelien Jarno.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3019 c046a42c-6fe2-441c-8c8c-71466251a162
---
 hw/ne2000.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/ne2000.c b/hw/ne2000.c
index 1625c55388..6d5aa56e17 100644
--- a/hw/ne2000.c
+++ b/hw/ne2000.c
@@ -224,7 +224,7 @@ static void ne2000_receive(void *opaque, const uint8_t *buf, int size)
 {
     NE2000State *s = opaque;
     uint8_t *p;
-    int total_len, next, avail, len, index, mcast_idx;
+    unsigned int total_len, next, avail, len, index, mcast_idx;
     uint8_t buf1[60];
     static const uint8_t broadcast_macaddr[6] = 
         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
@@ -293,7 +293,10 @@ static void ne2000_receive(void *opaque, const uint8_t *buf, int size)
 
     /* write packet data */
     while (size > 0) {
-        avail = s->stop - index;
+        if (index <= s->stop)
+            avail = s->stop - index;
+        else
+            avail = 0;
         len = size;
         if (len > avail)
             len = avail;
-- 
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